Viessmann C3HA, Installation And Service Instructions For Contractors

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124
Fault mes-
sage Cause Remedy Re-
set-
ting
"83: BSB
short cir-
cuit" BUS connection short circuit Check BUS cable
"84: BSB ad-
dress con-
flict" Programming unit or con-
necting cable to program-
ming unit faulty.
More than one remote con-
trol unit is assigned to a heat-
ing circuit. Check remote control - heat-
ing circuit assignment. Cod-
ing addresses 40, 42, 44,
46.
Check programming unit and
connecting cable
"85: BSB ra-
dio commu-
nication" Wireless connection inter-
rupted (e.g. remote control
unit) Restore wireless connection
(see installation instructions
for remote control unit)
"91: Data
loss in EE-
PROM" Connections interrupted or
control unit PCB faulty. Check all plug-in connec-
tions on the control unit PCB.
Replace control unit PCB if
necessary (see page 138). NRP
"92: Device
electronics
error"
"95: Time of
day invalid"
Wrong time set Reset time
"96: Minor
SW error" Software error Replace the control unit PCB
(see page 138). AR
"97: SW or
HW failure" Fault on control unit PCB. Carry out service reset. Re-
place control unit PCB if nec-
essary (see page 138). NRP
"98: Exten-
sion module
1" Fault in extension module for
heating circuit with mixer 1. Check plug-in connections
and connecting cables.
Check codes. Replace ex-
tension module if necessary.
"99: Exten-
sion module
2" Fault in extension module for
heating circuit with mixer 2.
"102: Clock
without
backup" Power reserve for time
switch exhausted (appliance
disconnected from the power
supply for a long time). Switch on appliance and re-
set time (see operating in-
structions).
"105: Main-
tenance
message" Service due. Service the appliance.
Troubleshooting
Fault messages
(cont.)
5618 294 GB